OH megamaser emission in the outflow of the luminous infrared galaxy Zw049.057
Paper in proceeding, 2022

High resolution (0.”26 × 0.”13 (70 × 35 pc)) L-band (18 cm) OH megamaser (OHM) e-Merlin observations of the LIRG Zw049.057 show that the emission is emerging from a low velocity outflowing structure - which is foreground to a fast, dense and collimated molecular outflow detected by ALMA. The extremely dusty compact obscured nucleus (CON) of Zw049.057 has no (or only little) OHM emission associated with it - possibly because of too high number densities that quench the OHM. In contrast we detect 6 cm H2CO emission primarily from the CON-region. We suggest that the OHM-region of Zw049.057 is not directly associated with star formation, but instead occurs in a wide-angle, slow outflow that surrounds the fast and dense outflow. The OHM is pumped by IR emission that likely stems from activities in the nucleus. We briefly discuss how OHM emission can be used as a probe of LIRG-CON galaxies.

galaxies: evolution

outflows

ISM: molecules

galaxies: active

galaxies: nuclei

ISM: jets

galaxies: individual: Zw049.057

Author

Susanne Aalto

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Boy Lankhaar

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Leiden University

Clare Wethers

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

J. Moldon

Institute of Astrophysics of Andalusia (IAA)

R. J. Beswick

University of Manchester

Proceedings of the International Astronomical Union

1743-9213 (ISSN) 1743-9221 (eISSN)

Vol. 18 40-44

Subject Categories

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

DOI

10.1017/S1743921323003307

More information

Latest update

3/14/2024